Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes Joeph Haydn This Sylvania 7F7 was tested

This Sylvania 7F7 was tested on our Paul Hart-calibrated TV7/U for shorts

They have 2-30 188-5 and 3-52 188-5 date/provenance codes

sheet getter

There were no shorts and it measured a perfectly-balanced 44/44 where minimum (65%) is 34/32 and 100% is 52/52

Matched Pair RCA 6FQ7 / 6CG7 Vacuum Tubes Joeph Haydn This Sylvania 7F7 was testedThis matched pair of RCA 6FQ7 6CG7 dual triodes was tested on our TV7 U for shorts, gas and transconductance. There were no shorts or gas and their readings are as follows: Tube One measured 56 58 while Tube Two measured 59 56 where minimum (65%) is 50 50 and 100% is 77 77. These tubes have steel support rods; ladder plates; side D getters and excellent flashing. As I write, I am playing them with adapters (not included) in my Alan Eaton single ended